Multicylinder steam-engine.



H. LENTZ.

MULTICYLINDER STEAM. ENGINE.

APPLICATION FILED 00121. 1914.

1,118,663, Patented N0v.24, 1914.

3 SHEETS-SHEET 1` WITNESSES: INVENTOR ATTORNEY 1ML 'mmf'.x fr; rERS CO l PHoroLlTll0, WASHINC TUN. D C

H. LBNTZ.

MULTIGYLINDER STEAM ENGINE.

APPLICATION FILED 00T.1. 1914.

Patented Nov. 24, 1914.

3 SIIEETS-SHEET 2.

INVENTOR H. LENTZ.

MULTIGYLINDER STEAM ENGINE.

APPLICATION FILED 00T. 1. 1014. 1 1 1 8,663. Patented Nov. 24, 1914.

3 SHEETS-SHEET 3.

ATTORNEY INE MORRIS PL'rERS CO,PHOTOIIT-0WASNINGKJN. 11C

MULTICYLINDER STEAM-EGINE.

, `Specfication. of Letters Patent.

Patented Nov. 24, 1914.

` Application filed October 1, 1914.` Serial No. 864,407.

T0 all fil/fiom t may concern `Be it known that I, HUGO LnNfrz, a citizen of the German Empire, and residing at Halensee, near Berlin, Germany, have invented certain new and useful Improvements in Multicylinder Steam-Engines, of whichthe following' is a specification.

This invention relates to multicylinder steam engines having puppet valve gear, and a primary object is to provide a steam engine of this type, particularly a marine steam engine, such that it can be assembled from a number of castings which can be readily made, and such that it is consequently not only simple and inexpensive to manufacture, but also exceedingly easy to erect and all its parts are accessible from all sides. I attain this end primarily by forming the cylinders of the individual pressurel stages as smooth tubes without any end projections like dead-heads, and byarranging .that each of the same takes telescopically at each end into an end member which contains the distributing1 passages, is common to several cylinders and holds `the individual cylinders together as one entirety.

Another' object of my invention is to provide novel hollow connecting` members between the said individual end members; these connecting members not only stiften the said end members but also constitute `receivers between the individual pressure' stages.

To these ends my invention consists in the Construction, arrangement and combination of parts described hereinafter and pointed out in the claims.

Two illustrative embodiments of my invent-ion `are represented by way of example in the accompanying drawings, wherein :M

`Figure 1 is a vertical longitudinal section through an improved compound steam engine or' the type described not comprising a receiver, and Fig. Qlis a horizontal section taken on the line 2-2 in Fig. l; Fig. 3 is a vertical longitudinal section through an iniproved multicylinder steam engine of the type described comprising receivers between the cylinders, and Fig. l is a longitudinal section taken on the line l-li in Fig. 3.

Referring iirstly to Figs. l and 2, a designates the high-pressure cylinder and 7) the low-pressure cylinder, both oit which are made as simple smooth tubes without jackets and without any parts like a dead-head. At a little distance from their ends these cylinders have flanges a. and b", as far as which they are turned. By means of these machine ends the cylinders a and t are `tele` scopically inserted at both ends into end members c and Z common to the two cyl? inders, whereby they are held together as one entirety. The distributing members and the passage ways t, u and 'v are provided only in the two end members 0 and rl, and the valve seats c, f and g are so located that they may be operated by suitable valve stems arranged parallel to the cylinders, as is now well understood. The ends 'Lv of the high#` pressure cylinder which take into the said end members constitute a boundary wall for; the one passage way u. The corresponding transverse wall in the said end members c` and (Z is done away with entirely, so that these members can be readily molded and cast.

The lower `casting c is made as a closed cylinder end, while parts of the upper casting cl constitute distance rings` which are open at one side and closed at the other by the customarycylinder covers la and t'.

A multicylinder steam engine made as described above can be built exceedingly simply and readily because not only the cyll inders, but also the said end members and the covers are simple castings which can be readily molded. As each of the said end members c and d in this arrangement c011- stitutes an independent multistage distributing systeln and can befremoved together with the distributing valves without detaching any other parts, the engine can be erected readily and simply which is agreat advantage, particularly for marine engines, because the space at disposal is very small. In addition, in this engine the pistons and the distributing members are very accessible, because the upper end member need not be removed iirst, and it suffices to remove only the upper covers 7L and z'. The valvegear can be then dismantled because the valve spindles are located parallel to the cylindersand consequently can be removed above or below. Owing to the interengaging parts of the cylinders and the said members the entire engine is exceedingly stable, because the individual members mutually stiti'cn one another. Nevertheless the hereindescribed novel arrangement enables the hi gli-pressure cylinder working with superheated steam to expand independently of the low-pressure cylinder without the connien. i

' wise.

nection of the cylinders being impaired thereby in the least. The cylinders acquire only the mean temperature of expansion, whereas only the end members contact di-k rectly with the superheated steam. Also, each cylinder can be readily exchanged for another.

Referring to Figs. 3 and et, in this embodiment a again designates the high-pres` sure cylinder and b the low-pressure cylinder, and they are respectively inserted in the manner describedabove into separate end members Z, if: and m, n. All these end members are firmly connect-ed together by a common i-shaped middle member o. lf desired, this member may be shaped otherlhis middle member not only unites the individual end members into one framework, into which the individual cylinders are telescopically inserted as is indicated in dotted lines in the upper part of Fig. 3, but it also constitutes a receiver between the high and low pressure cylinders, for which purpose it is made hollow and is connected Adirectly to the inlet and exhaust ports at the two ends of the cylinder. `When a larger number of cylinders are employed a hollow middle member p acting as a receiver may be arranged at the other ends of the said end members m and a. The upper end members Z and n are open above and closed by separate covers g and r. This construction also has the same advantagesmentioned as attaching to the embodiment first de` scribed above. It is to be understood that as many cylinders or pressure stages as desired may be connected in the hereinde` scribed manner without departing from the scope of my invention.

l. lfn a multiple cylinder steam engine, the combination of a plurality of differentstage cylinders, and a plurality of end members having telescopic connection with the ends of the cylinders, said end members each having at least three webs disposed in different planes substantially at right angles to the plane common to the axis of the cyllnders and forming a plurality of narrow and relatively deep passages communicating ing with the passages thereof to form a part` of the passageway for the flow of steam between adjacent cylinders and to-serve as a stiifening member for the engine.

3. In a multiple cylinder steam engine, the combination of a plurality of differentstage cylinders, a plurality of end members having telescopic connection with the ends of the cylinders, said end members having formed therein passages for the flow of steam between adjacent cylinders, and a receiver between adjacent cylinders disposed longitudinally thereof andhaving hollow ends disposed between and connected to corresponding end members of adjacent cylinders and communicating with the passages thereof whereby said receiyer serves as a part of the passageway for the steam between adjacent cylinders, and as a stiften ing member for the engine.

ln testimony whereof, I afiiX my signature in the presence of two witnesses.

HUG@ LENTZ.

`llitnesses HENRY HASPER, WOLDEMAR HAUPT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, 31C. 

